But it emerged today Anderson was spoken to about an unrelated assault accusation a fortnight ago, and should have been behind bars - but a computer glitch meant officers did not realise he was the subject of five outstanding arrest warrants for repeatedly failing to attend court dates.

Devastated: Luke Batty's mum Rosie (Photo: Rex)

It has also emerged police warned a judge that they feared Anderson would kill - but these warnings were ignored.

Bail documents obtained by the Herald Sun show officers objected to a bail application from Anderson in June last year, saying "genuine concerns are held... by police as the accused appears more than capable of carrying out the threats to kill".

First Constable Paul Topham also warned Anderson's behaviour was becoming "more erratic and aggressive", and raised Rosie's concerns about the welfare of their son.

But magistrates still granted the father bail.

Victoria's children's commissioner has now announced an enquiry into the death of sports fan Luke, which will look at whether the system failed Anderson, his son and Rosie.